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Nine oil and gas stocks are moving up in their overall rating this week, according to the Portfolio Grader database. Every one of these is graded an “A” (“strong buy”) or “B” overall (“buy”).

Chesapeake Midstream Partners (CHKM) is making progress this week as its rating of C (“hold”) from last week increases to a B (“buy”) rating this week. Chesapeake Midstream Partners owns, operates, develops, and acquires natural gas, natural gas liquids, and oil gathering systems, as well as other midstream energy assets in the United States. For more information, get Portfolio Grader’s complete analysis of CHKM stock.

PVR Partners, L.P. (PVR) gets a higher grade this week, advancing from a C last week to a B. PVR Partners owns and operates a network of natural gas pipelines and processing plants which provide gathering, transportation, compression, processing, dehydration and related services to natural gas producers. Even though the stock was upgraded, it has remained flat from a week ago. The stock’s dividend yield is 2.2%. For more information, get Portfolio Grader’s complete analysis of PVR stock.

Niska Gas Storage Partners (NKA) gets a higher grade this week, advancing from a C last week to a B. Niska Gas Storage is an independent owner and operator of natural gas storage assets in North America. Investors have pushed the stock price up 10.4% over the past month. Shares of the stock have been changing hands at an unusually rapid pace, twice the rate of the week prior. For more information, get Portfolio Grader’s complete analysis of NKA stock.

Louis Navellier’s proprietary Portfolio Grader stock ranking system assesses roughly 5,000 companies every week based on a number of fundamental and quantitative measures. Stocks are given a letter grade based on their results — with A being “strong buy,” and F being “strong sell.” Explore the tool here.